Common units of Measurement for Speed - Gov 421... · Common units of Measurement for Speed ......
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Common units of Measurement for Speed km/hr mi/hr m/s Challenge: How could you convert between km/hr and m/s? LokenTimer2.swf Title: Apr 119:53 AM (1 of 48)
Transcript of Common units of Measurement for Speed - Gov 421... · Common units of Measurement for Speed ......
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CommonunitsofMeasurementforSpeed
km/hr mi/hr m/s
Challenge:Howcouldyouconvertbetweenkm/hrandm/s?
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ConvertingUnitsofTime
Howcanyouchangeunitsoftime:Forexample:
Howmanysecondsarein3.5days?
Howmanydaysaretherein6900minutes?
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Challenge:
Howcouldyouexpress9days,15hours,and38minutesin hours.
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Homework:Questions12,page358
1.a)Howisaveragespeeddifferentfrominstantaneousspeed?
b)Whenaretheythesame?
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2.Acarandtrucktravelalongthesamehighway,withthecarmovingfasterthanthetruck.
a)Howdotheirdistancestravelledcompareafterthesamelengthoftime?
b)Howdotheirtimescompareaftertravellingthesamedistance?
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Motion:RelatingSpeed,Distance,andTime
Whatisspeed?
Giveexamplesofspeedsofmovingobjects.
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Definition:
Speedisarateofmovement.Itisexpressedasadistancecoveredoveraunitoftime.
So...speedwillalwaysincludetwocomponents...DistanceandTime.
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CalculatingSpeedIfyouknowadistancetobetravelled,andyouknowhowlongittakes,howcanyoucalculatethespeed?
Forexample,ifyouknowittakesapproximately45minutestocoverthe65kmfromSummersidetoCharlottetown,howfast,inkm/hr,areyoudriving?
*Note:firstchangeyourtimeintohours
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FormulaforSpeed:
Speed=Distance/Time
or S=D/T
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Averagevs.Instantaneousspeed
WhenyoumakethetripbetweenSummersideandCharlottetown,areyougoingatexactlythesamespeedthewholetime?
AverageSpeed:
InstantaneousSpeed:
Thesewillbethesameifspeedis:
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Whatdoesthespedometerinyourcarmeasure?
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Whatistheaveragespeedofacarthattravels147kmin1.5hours?
Speed:
Distance:
Time:
ProblemSolvingMethod
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Trythis:
Acheetahcancover2200min75.0seconds.Whatisacheetah'saveragesprintingspeed?
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CompleteQuestions3and4onpage358
3.a)TwohikerswalktheTransCanadatrailfor6.0hoursandcover31km.Whatistheiraveragespeed?
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3.b)ThreebikersontheTrailcyclefor6.0hoursandcover85km.Whatwastheiraveragespeedfortheday?
*Doesthismeantheyrodeatthatspeedtheentiretime?Explain!
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3.c)Marywalkedfor2.1hoursataspeedof3.6km/hr.Whatdistancedidshetravel?
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3.d)Howlongwouldittakeahikertotravelatotaldistanceof25.0kmatanaveragespeedof5.2km/hr?
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4.Thecruisecontrolofacarissetat90.0km/hr.Whatdistanceistravelledbythecarin2.50hours?
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Openyourbookstopage358.
Gothroughquestions69together.
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ChallengeQuestion!
Youareoutwalking,whenapackofwolvescomesoutofthewoodsbehindyou,andstartschasingyoudown.Youare250mfromthesafetyofyourhouse,andthewolvesarestartingout50.0mbehindyou.Youcanrunatamaximumaveragespeedof12.6km/hr.Wolves,however,canrunatanaveragespeedof4.0m/s.
Doyoumakeittosafety...orareyoulunch?
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Rearrangingtheformula
WealreadyknowthatS=D/T
Whatformulawouldweusetofinddistancetravelledifweknewthespeedandtime?
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Trythis:
ThemaximumspeedpostedinNewBrunswickis110km/hr.Howfarcouldyoutravelatthisaveragespeedin2.75hours?
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Whatifweknowthespeedanddistance?Howcanwefindthetimeitwouldtaketocoverthedistance?
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Trythis:
Acyclistcanmaintainanaveragespeedof21.0km/hr.Howlongwouldittakethemtocompletea38.0kmtrail?
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Openyourbookstopage358.
CompleteandReview#10onpage359.
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Homework
CompletetheAssignmentsheetonSpeedproblemsforMonday...
don'tforgetthatthelabreportsaredue!
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